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H ELSINKI U NIVERSITY OF T ECHNOLOGY. AAA Architecture for hierarchical wireless Mobile IPv4. Tom Weckström Telecommunications Software and Multimedia Laboratory of Information Processing Science Helsinki University of Technology Finland. H ELSINKI U NIVERSITY OF T ECHNOLOGY.

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Aaa architecture for hierarchical wireless mobile ipv4

HELSINKI UNIVERSITY OF TECHNOLOGY

AAA Architecture for hierarchical wireless Mobile IPv4

Tom Weckström

Telecommunications Software and Multimedia

Laboratory of Information Processing Science

Helsinki University of Technology

Finland


Introduction

HELSINKI UNIVERSITY OF TECHNOLOGY

Introduction

  • Wireless Internet gaining momentum

  • Yankee: 1billion users by 2003

  • Is access the wireless killer application?

  • Mobile users need to be authenticated, authorized, and correctly billed.


Problem

HELSINKI UNIVERSITY OF TECHNOLOGY

Problem

  • Special needs for AAA protocol in

    • Open environment

    • Wireless environment

  • Problem dimensions

    • Trust

    • Security

    • Efficiency


Scope
Scope

  • Mobile IPv4 environment that is

    • Open

    • Hierarchical

    • Wireless

  • Lots of active mobile users

  • Frequent, fast handoffs



Hierarchical mobile ipv4

Mobile Node

Mobile Node

Mobile Node

HELSINKI UNIVERSITY OF TECHNOLOGY

Hierarchical Mobile IPv4

Home Network

CN

HA

Internet

HFA1

HFA1

SFA

Foreign Network

FA1

FA1

FA2

FA2

FA2

WLAN

FA3

FA4

FA4

FA4

FA5

FA5

FA5

FA6


Criteria
Criteria

  • From IDs, scope and RFC 2477

  • 11 criteria, classified and prioritized

  • General, dimensional and AAA criteria

  • GQM approach for measuring success


My solution
My solution

AAA Architecture with tick payments


Design principles
Design principles

  • Parallel AAA and MIP signaling

  • Reduced number of signaling messages

  • Periodic payments

  • SPKI with RSA

  • Ideas from Ipay, DIAMETER and BillNeat


Architectural elements
Architectural elements

  • AAAH, SHA, HA

  • AAAF, HFA, FA

  • Broker

  • MN

  • Buyer



Trust relationships

HELSINKI UNIVERSITY OF TECHNOLOGY

Trust relationships


Security
Security

  • RSA for signatures

  • SHA for payment messages

  • Symmetric encryption for authentication, session keys, and signatures

  • Session ID

  • Billing ID

  • Timestamps for replay protection


Protocol operation
Protocol operation

  • Registration protocol

    • Slow mode: sequential, for compatibility

    • Fast mode: Parallel, optional grace period

  • Payment protocol

    • Real time payments

    • Localized message handling

    • Policy based authorization

    • User controls the size of the bill





Conclusions
Conclusions

  • Potential for significant improvements with parallel signaling

  • Static trust relationships concentrated within organizational units

  • Flexibility with SPKI and Policy Management

  • Tick payments: efficiency & control


Future research ideas
Future research ideas

  • More extensive use of SPKI

    • Trust relationships

    • Certificate management

  • Improved verification of credibility

  • Integration with DIAMETER

  • Policy management with distributed policies



  • Aaa architecture for hierarchical wireless mobile ipv41

    HELSINKI UNIVERSITY OF TECHNOLOGY

    AAA Architecture for hierarchical wireless Mobile IPv4

    Tom Weckström

    Email

    [email protected]

    WWW

    http://www.cs.hut.fi/Research/Dynamics/


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